<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>特殊符号显示</title>
</head>
<body>
    <!-- 
        空格：&nbsp;
        小于：&lt;
        大于：&gt;
        按位与：&amp;
    -->
    <p>这是4个&nbsp;&nbsp;&nbsp;&nbsp;空格</p>
    <p>按位与：&amp;</p>
    <p>大于：&gt;</p>
    <p>小于：&lt;</p>
</body>
</html>